As you can see each driver is provided with jumpers that can be set to configure the microstepping for the A4988. You will need a To measure the reference voltage, the driver needs to be powered. Now you will need to measure the reference voltage (Vref) between the two points marked on the picture below (GND and the potentiometer) and adjust it to the value you calculated.Note: There is another way to measure the current limit and that is to directly measure the current draw of the stepper motor. You can easily plug-in the A4988 drivers. But in this tutorial, I will use only two drivers. If you want to study more about this you can download the A4988 driver datasheet by clicking on the download button given below.The next 3 pins (MS1, MS2, and MS3) are used for selecting one of the five step resolutions as per the truth table available in the datasheet.These pins have internal pull-down resistors so if we leave them disconnected, the board will operate in full step mode.The last pin is the ENABLE pin which is used for turning on or turning off the FET outputs.

If you want to make your own CNC or 3D printer, this motor is the most suitable one.The Model number of this Bipolar stepper motor is 42BYGH40-1.8-22A. Internally this pin is pulled low so you can leave this pin floating to keep it enabled. If you have any questions, suggestions, or if you think that things are missing in this tutorial, Note that comments are held for moderation to prevent spam.I am planning to use the program to position the traverser on which trains are stored on my model railway before entering the sceniced part of the railway. Make sure the external high voltage power is not powered-up or connected; Connect a stepper motor to the stepper controller socket you want to test. 22,926 views; 5 comments; 47 respects; Disassemble an old printer (in this case a dot matrix) and drive the stepper motor(s) for linear motion or rotation. You can find more specifications in the table below. Please note that you can also drive stepper motor using A4988 Stepper motor driver module. Currently, I am running my own YouTube channel "Electronic Clinic", and managing this Website. This gets me started right away! This integrated motor driver makes interfacing with a microcontroller super easy as you only need two pins to control both the speed and the direction of the stepper motor.The driver has a maximum output capacity of 35 V and ± 2 A which is great for driving small to medium-sized stepper motors like a If you need to control larger stepper motors like NEMA 23, take a look at the TB6600 stepper motor driver. You should set the current limit to be at or lower than the current rating of the motor.In this method we are going to set the current limit by measuring the voltage (Vref) on the “ref” pin.An easy way to make adjustments is to use an alligator clip on the shaft of a metal screwdriver and attach that to your multimeter so that you can measure and adjust the voltage with the screwdriver at the same time.In this method we are going to set the current limit by measuring the current running through the coil.You will need to perform this adjustment again if you ever change the logic voltage(VDD)Now that we know everything about the driver, we will connect it to our Arduino.Connections are fairly simple. Here we also need to mention that these 2 pins are not pulled to any voltage internally, so we should not leave them floating in our program.The sleep pin can be used to minimize power consumption when the motor is not in use. A4988 Specifications How cool is that!The stepper motors use a cogged wheel and electromagnets to rotate the wheel one ‘step’ at a time.Each HIGH pulse sent, energizes the coil, attracts the nearest teeth of the cogged wheel and drives the motor one step.The way you pulse these coils greatly affects the behavior of the motor.At the heart of the module is a Microstepping Driver from Allegro – A4988. If you are planning on building your own 3D printer or a CNC machine, you will need to control a bunch of stepper motors.

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